Export the JWT secret and API keys from the CLI or API

We'd like to provision new supabase instances for each of our feature branches, so our product team can preview the result before it's merged and released.
We currently create a new supabase project using the CLI, but there's the manual step of actually logging in and fetching the tokens.
If the management API could return these values, we would be able automate the entire process.
There's already an API that does this, the one the dashboard accesses, but it's secured by OAuth. We tried using password but there's a captcha.